<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
    </head>
    <body>
        <select id="selCategory">
            <option>-请选择商品类别-</option>
            <option>正在获取商品类别...</option>
        </select>
        <select id="selFamily">
            <option>-请选择系列-</option>
        </select>
        <select id="selProducts">
            <option>-请选择商品名称-<option>
        </select>
        <script src="js/jquery-3.2.1.js"></script>
        <script>
        </script>
    </body>
</html>